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must install DVD-RAM capabilities

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waldmattis
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must install DVD-RAM capabilities

#1 Postby waldmattis » Wed Aug 30, 2017 12:29 pm

Hi everybody,
System-Infos:
Intel(R) Core(TM)2 Duo CPU P7350 @ 2.00GHz
4GB RAM
NVIDIA Corporation G96M [GeForce 9600M GS]

MX-16.1, 64bit
external DVD-Burner: HL-DT-ST - DVDRAM GT51N, connected via USB2

Actually I have to install DVD-RAM capabilities.
Sort of DVD-RAM media: Verbatim 4,7GB, speed 3x

Thanks for every help!

Regards
Karl

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dolphin_oracle
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Re: must install DVD-RAM capabilities

#2 Postby dolphin_oracle » Wed Aug 30, 2017 12:48 pm

does not Xfburn not handle dvd-ram?
http://www.youtube.com/runwiththedolphin
eeepc 904ha antix 15 32 bit (streaming media player)
acer c720p chromebook - chromeos / MX15-64 (custom snapshot) live USB.
lenovo s21e - antiX-16 MX16(live-usb)

waldmattis
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Re: must install DVD-RAM capabilities

#3 Postby waldmattis » Wed Aug 30, 2017 3:05 pm

@dolphin_oracle

in the (german) ubuntuusers forum
URL: https://wiki.ubuntuusers.de/DVD-RAM/

I found, that the (here: ubuntu-)system must be modified to work with DVD-RAM,

Changes in /etc/fstab

So for example the file /etc/fstab should be modified with an Editor [1] with Root-rights, so that the media in the DVD-RAM-Burner will be mounted as writable.

The line
/dev/sdd /media/cdrom0 udf,iso9660 ro,user,noauto 0 0
shall be altered to
/dev/sdd /media/cdrom0 udf,iso9660 rw,user,noauto,noatime 0 0

##/dev/sdd can show other value depending on the real place of the drive.
## noatime prohibits, that the Access-Time of files are actualized with every read access.

This shall save a lot of writing to the media so giving a better period of media-life.

I could not even open kwrite with root-rights.
What is the command in MX-16 for opening fstab with root?

Xfburn did not do the job.

Regards
Karl

PS
Please excuse my poor English

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Stevo
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Re: must install DVD-RAM capabilities

#4 Postby Stevo » Wed Aug 30, 2017 3:54 pm

Sometimes following Ubuntu directions will work, but sometimes they will lead to a complete disaster. (Backups!!!) Knowing which is which... aye, that's the trick.

What's in your /etc/fstab right now? ("cat /etc/fstab" in the terminal is a way to do that)

scdbackup
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Re: must install DVD-RAM capabilities

#5 Postby scdbackup » Thu Aug 31, 2017 3:35 am

Hi,

i cannot help with the editing problem, but need to comment that german
wiki article.

The statement that burn programs would refuse on DVD-RAM must be
at least 10 years old. I just tried with Xfburn 0.5.2 on Debian 8,
which uses my libburn to access the drive. It works. Slowwwly.
Checking the Options box "Stream Recording" brings effective speed
to 2x (= 2.7 MB/s) which is the nominal speed of the medium.
Still slow. DVD+RW makes 5.5 MB/s, BD-RE with Stream Recording 9 MB/s.

(Xfburn crashes here if i add files by double click rather than by
the "Add" button. Desktop libraries ... oh my ... i normally use
xorriso.)

I am puzzled by the statement that a drive with a DVD-RAM would show
up as /dev/sd*.
What kernel would not represent the drive as /dev/sr* (or /dev/hd* if
it is very old) ?

In general, DVD-RAM are the worst of all DVD types. All its alleged
advantages over DVD+RW or formatted DVD-RW are not to see in practice.
They are slow, short lived, and have less capacity than other DVDs.

The Ubuntu wiki page talks of making DVD-RAM a replacement for a
hard disk. This will have effective write speeds in the range of a
single MB per second. (You will be much happier with a 4 GB USB stick
for that use case.)

None of my DVD-RAM test media came with an UDF filesystem on it.
They were pre-formatted on hardware level, unlike their big and well
usable successor BD-RE.
UDF specs mention a special "build" (write strategy) for optical media,
but afaic the Linux UDF driver uses the build for hard disk ("plain").
Note that
https://en.wikipedia.org/wiki/Universal ... ifications
associates "packet writing" with "VAT" build.

But i doubt that UDF "VAT" is what is meant with "packet writing" in
the article. It refers to pktcdvd, which is a buffer mechanism that
consolidates writes in chunks of 32 KB. Better than chunks of 2 KB
which are the natural block size of optical media.
Main job of pktcdvd is to make formatted CD-RW or DVD-RW usable as
random access devices like DVD+RW or DVD-RAM. Formatted DVD-RW
must be written in full 32 KB pieces. Smaller writes need to read
the target piece, modify it, and write it back as a whole.

Much in the article is half-wrong. One would have to compare the
performance of libburn Stream Recording to pkrcdvd random access.
I bet on mine. Braggingly and knowing the SCSI/MMC specs.
(This does not mean that random access and UDF would not have their
use cases. But on that turf, DVD-RAM is simply substandard.)

Zorry for any rant aspects of this post.
I could double the rant content by writing this in german. Sarcasm
and perky pun inclusive.

Have a nice day:)

Thomas


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